#2175C3
Closest named color: Windows Blue (#3778BF). oklch(55.4% 0.144 251.1), rgb(33, 117, 195).
Aa
White text reads best on this color (4.77:1).
About this color
#2175C3 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.144 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.019 away. White text reads best on it, at 4.77:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.39:1 |
| White text | 4.77:1 |
Values
| HEX | #2175C3 |
| RGB | rgb(33, 117, 195) |
| HSL | hsl(209, 71%, 45%) |
| OKLCH | oklch(55.4% 0.144 251.1) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #2175C3 | 4.77:1 | AA | Lc -78.1 | Fine for body text |
| Black text on #2175C3 | 4.39:1 | AA large text | Lc 31.4 | Non-text elements, placeholder text |
| #2175C3 text on white | 4.77:1 | AA | Lc 72.7 | Content text, not long reading |
| #2175C3 text on black | 4.39:1 | AA large text | Lc -29.0 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C8DBF1
oklch(88.4% 0.037 252.1)
-
Step 300
300
#A2C4EA
oklch(80.9% 0.065 251.5)
-
Step 400
400
#6EA5DF
oklch(70.7% 0.103 250.7)
-
Step 500
500
#458DD6
oklch(63.1% 0.132 251)
-
Step 600
600 (this color)
#2175C3
oklch(55.4% 0.144 251.1)
-
Step 700
700
#1362A9
oklch(49% 0.134 251.4)
-
Step 800
800
#145189
oklch(42.8% 0.11 250.9)
-
Step 900
900
#19436D
oklch(37.6% 0.086 251.2)
-
Step 950
950
#102840
oklch(27.1% 0.054 250.5)
#2175C3 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #4F7AC6 | 0.042 |
| Deuteranopia (no green cones) | #346CC1 | 0.025 |
| Tritanopia (no blue cones) | #008892 | 0.107 |
| Achromatopsia (no color) | #737373 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2175C3
#2175C3
oklch(55.4% 0.144 251.1)
- #9E6500
#9E6500
oklch(55.5% 0.12 71.1)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #2175C3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.019
- Mid Blue #276AB3 ΔE 0.036
- Nice Blue #107AB0 ΔE 0.036
- French Blue #436BAD ΔE 0.043
- Flat Blue #3C73A8 ΔE 0.044
- Water Blue #0E87CC ΔE 0.049
- Muted Blue #3B719F ΔE 0.056
- Steel Blue #4682B4 ΔE 0.057
Use #2175C3 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.